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Old 11-08-2018, 1:27 PM
Join Date: Jan 2011
Location: Springfield,Greene County, MO
Posts: 15
Default MODOT Changes

I have not been hearing much of anything out of MODOT on their listed frequencies anymore. They show a standard trunked radio system from what I can tell on RR. However, along about the time I stopped hearing them I found a "case study" by Zetron Corporation where they overhauled the MODOT radio system and it appears to have a lot of ip based control points now. (See ). Does anyone know if there is a new P25, etc. system they are using now? Any info would be appreciated. Thanks.
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Old 11-08-2018, 1:58 PM
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Join Date: Dec 2016
Posts: 86

I wonder why they did not get on the already existing MOSWIN System.

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Old 11-08-2018, 6:52 PM
Join Date: Jan 2011
Location: Springfield,Greene County, MO
Posts: 15

Interesting question. I know they built towers all over the state in the late 1960's so it was already in place. Overall cost should be less using MOSWIN long term (I would think).
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Old 11-09-2018, 7:46 AM
Join Date: Apr 2009
Location: Clinton County, MO
Posts: 907

Just a guess here, but I think the Zetron equipment is probably replacing the stand alone tone-remote or DC-remote control equipment at the district offices with equipment that integrates those functions into a desktop computer.

I did a quick listen last night during the snow and heard Modot on the same frequencies they were on a few years when this topic came up.

Here is a list of the VHF frequencies that Modot is licensed for. The repeaters are all in the 151-152 MHz range, but the truck-to-truck simplex traffic can be heard on anything. Even frequencies that are used for repeater input in one district may be used for simplex in another district.

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